JP4082551B2 - Valve for control muffler - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an exhaust pressure sensitive control muffler valve that is provided at an end of an exhaust pipe in a muffler and opens and closes by exhaust pressure.
[0002]
[Prior art]
As a conventional control muffler valve of this type, for example, as shown in FIG. 4, a support shaft 105 with respect to a tapered seat surface 104 of a valve seat 103 provided at an end of an exhaust pipe 102 in the muffler body 101. And a coil spring 107 that abuts the valve body 106 against the tapered seat surface 104 of the valve seat 103 and urges the valve in a closing direction. A structure in which a buffer seal member 108 is fixed to the tapered seat surface 104 side of the valve seat 103 (described in Japanese Patent Laid-Open No. 10-131738) is known.
[0003]
Since the buffer seal member 108 is in the muffler body and is exposed to high-temperature exhaust gas, a heat-resistant wire mesh is generally used. The wire mesh buffer seal member is used. 108 is fixed to the tapered seat surface 104 of the valve seat 103 by spot welding.
[0004]
[Problems to be solved by the invention]
However, the control muffler valve of the conventional example has a structure in which the buffer seal member 108 made of wire mesh is fixed by spot welding on the tapered seat surface 104 of the valve seat 103 as described above. As shown in the enlarged cross-sectional view of the main portion of FIG. 5, a large recess 109 is formed in the wire mesh portion of the spot welded portion, and the buffer seal member 108 and the tapered seat of the valve seat 103 are heated by local high temperature during spot welding. There was a problem that the surface 104 portion was deformed, thereby deteriorating the gas sealing performance of the valve.
[0005]
The problem to be solved by the present invention is to provide a control muffler valve capable of preventing deterioration of gas sealing performance when the valve is closed.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the invention described in claim 1, a valve body provided to be openable and closable via a support shaft with respect to a valve seat provided at an end of an exhaust pipe portion in the muffler body, and the valve body In a control muffler valve provided with an urging means for urging the valve seat in a closing direction by making contact with the seat surface of the valve seat, heat resistance is applied to a sealing surface side of the valve body that contacts the seat surface of the valve seat. A heat-resistant cushioning seal member is provided, and the heat-resistant cushioning seal member is a means that is fixed to the valve body at a location off the sealing surface of the valve body that contacts the seat surface of the valve seat.
[0007]
According to a second aspect of the present invention, there is provided a valve body that is openable and closable via a support shaft with respect to a valve seat that is provided at an end of an exhaust pipe portion in the muffler body, and the valve body that is seated on the valve seat. And a biasing means for biasing the valve in the direction of closing the valve, a heat-resistant buffer seal member is provided on the seat surface side of the valve seat, and the heat-resistant buffer seal member is Means fixed to the valve seat at a position off the seat surface of the valve seat with which the sealing surface of the valve body abuts.
[0008]
According to a third aspect of the present invention, in the control muffler valve according to the first or second aspect, the heat-resistant buffer seal member is made of a wire mesh and is fixed to the valve body by spot welding.
[0009]
According to a fourth aspect of the present invention, in the control muffler valve according to the first or second aspect, the heat-resistant buffer seal member is fixed to the valve body via a fixing member.
[0010]
[Action and effect]
In the first aspect of the present invention, as described above, the heat-resistant buffer seal member is fixed to the valve body at a position where the seal surface of the valve body that contacts the seat surface of the valve seat is removed, thereby providing the heat-resistant buffer seal. The deformation of the member is prevented, and the smoothness of the seal portion is maintained, whereby the effect that the gas sealability when the valve is closed can be improved.
[0011]
In the invention according to claim 2, as described above, the heat-resistant buffer seal member is fixed to the valve seat at a position off the seat surface of the valve seat where the seal surface of the valve body abuts, so that the heat-resistant buffer seal The deformation of the member is prevented, and the smoothness of the seal portion is maintained, whereby the effect that the gas sealability when the valve is closed can be improved.
[0012]
In the invention according to claim 3, as described above, the heat-resistant buffer seal member is made of a wire mesh and is fixed by spot welding, so that an extra fixing member can be omitted and cost can be reduced. It becomes like this.
[0013]
In the invention according to claim 4, as described above, the heat-resistant buffer seal member is fixed to the valve body via the fixing member, so that the heat of welding is higher than that in the case where the heat-resistant buffer seal member is directly spot welded. It becomes possible to avoid the influence on the seal portion due to the above.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The control muffler valve according to the embodiment of the present invention corresponds to the first and fourth aspects of the invention.
First, the configuration of a control muffler valve according to an embodiment of the present invention will be described with reference to the drawings.
[0015]
1 is a plan view showing a control muffler valve according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view taken along line II-II in FIG. 1, and FIG. 3 is a longitudinal end view taken along line III-III in FIG. In these drawings, 1 is a valve seat, 2 is a valve body, 3 is a support shaft, 4 is a bush, 5 is a coil spring (biasing member), 6 is a heat-resistant buffer seal member, and 7 is a fixing member.
[0016]
The valve seat 1 extends to a pipe portion (exhaust pipe portion) 11 that is connected and fixed to an end portion of the exhaust pipe P in the muffler body, and expands outward from the end portion of the pipe portion 11. Tapered sheet portion 12 provided, substrate portion 13 extending horizontally from the outer peripheral edge of one end of taper-shaped sheet portion 12, and a shaft support portion vertically bent by bending upward both side portions thereof 14 and 14, and the shaft support portions 14 and 14 are formed with shaft holes 15 and 15. The upper surface side of the tapered sheet portion 12 is a tapered sheet surface 16.
[0017]
The valve body 2 includes a main body portion 21, a tapered seal portion 22 that extends so as to expand outward from the outer periphery of the main body portion 21, and an outer peripheral edge at one end of the tapered seal portion 22. And a shaft support portion 24, 24 vertically bent by bending the both sides of the substrate portion 23 horizontally, and both shaft support portions 24, 24 have shaft holes 25, 25 is formed. A tapered seal surface 26 is formed on the lower surface side of the tapered seal portion 22.
[0018]
Both shaft support portions 24, 24 of the valve body 2 are located inside the shaft support portions 14, 14 of the valve seat 1, and the shaft holes 15, 15 of both shaft support portions 14, 14 and both shafts are arranged. By inserting the support shaft 3 through the shaft holes 25 and 25 of the support portions 24 and 24, the valve body 2 is assembled to the valve seat 1 so as to be openable and closable around the support shaft 3. The support shaft 3 is fixed by welding 31 and 31 at both ends of the support shaft 3 outside the shaft support portions 14 and 14.
[0019]
The bushes 4 and 4 are mounted in the shaft holes 25 and 25 in the shaft support portions 24 and 24 of the valve body 2, respectively. The bushes 4 and 4 are formed by pressing and solidifying a stainless wire mesh, and are cylindrically interposed between the shaft holes 25 and 25 of the shaft support portions 24 and 24 and the support shaft 3. The main body 41 is composed of the shaft support portions 24 and 24 and the outward flange portion 42 interposed between the shaft support portions 14 and 14.
[0020]
The coil spring 5 is mounted around the support shaft 3, and both ends of the coil spring 5 are in contact with and locked to the main body portion 21 of the valve body 2 and the base plate portion 13 of the valve seat 1. The tapered seal portion 22 is brought into contact with the tapered seat portion 12 of the valve seat 1 to bias the valve in the closing direction.
[0021]
In the embodiment of the present invention, the heat-resistant buffer seal member 6 is provided on the tapered seal surface 26 side of the valve body 2. That is, the heat-resistant buffer seal member 6 compresses the stainless steel wire mesh so that the annular taper portion 61 along the tapered seal surface 26 of the valve body 2 and the inner peripheral edge of the annular taper portion 61 are inward. And an annular horizontal portion 62 having a through hole 63 formed in the center.
[0022]
On the other hand, the fixing member 7 is a member for mounting and fixing the heat-resistant buffer seal member 6 to the valve body 2 and is formed in a disc shape, and in the through hole 63 of the heat-resistant buffer seal member 6 in the center thereof. An insertable projecting surface 71 is formed. Then, the projecting surface portion 71 is spot welded to the lower surface of the main body portion 21 of the valve body 2, and the annular horizontal portion 62 is sandwiched between the main body portion 21 and the outer peripheral edge portion 72 of the fixing member 7. The heat-resistant buffer seal member 6 is attached and fixed to the valve body 2.
[0023]
Next, the operation and effect of the embodiment of the present invention will be described.
Since the control muffler valve according to the embodiment of the present invention is configured as described above, the fluid force (exhaust pressure) due to the exhaust gas flowing in the muffler is small at the time of low engine rotation. The biasing force exceeds and the valve is kept closed.
[0024]
In the closed state of the valve, the annular tapered portion 61 of the heat-resistant buffer seal member 6 mounted and fixed to the tapered seal surface 26 of the valve body 2 is in surface contact with the tapered seat surface 16 of the valve seat 1, and predetermined The state is maintained by the urging force.
[0025]
A structure in which the heat-resistant buffer seal member 6 is fixed to the valve body 2 via the fixing member 7 at a position where the heat-resistant buffer seal member 6 is removed from the tapered seal surface 26 of the valve body 2 that contacts the tapered seat surface 16 of the valve seat 1. As a result, the heat-resistant buffer seal member 6 is prevented from being deformed, and the smoothness of the seal surface is maintained. Therefore, the gas seal performance when the valve is closed can be improved. can get.
[0026]
Further, by fixing the heat-resistant buffer seal member 6 to the valve body 2 via the fixing member 7, the seal portion by welding heat is compared with the case where the heat-resistant buffer seal member 6 is directly spot welded to the valve body 2. It will be possible to avoid the impact on.
[0027]
Next, when the engine is running at high and high speeds, the fluid force (exhaust pressure) due to the exhaust gas flowing in the muffler increases, so the fluid force exceeds the urging force of the coil spring 5 and the valve opens. .
[0028]
Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment of the present invention, and even if there is a design change or the like without departing from the gist of the present invention, the present invention is not limited thereto. included.
[0029]
For example, in the embodiment of the present invention, the seat surface of the valve seat 1 and the seal surface of the valve body 2 are formed in a tapered shape, but the present invention is also applied to a planar surface. can do.
[0030]
In the embodiment of the present invention, the heat-resistant cushioning seal member 6 provided on the seal surface side of the valve body 2 is taken as an example, but the present invention is also applied to the one provided on the seat surface side of the valve seat 1. Can be applied.
[0031]
Further, in the embodiment of the invention, the annular horizontal portion 62 extended to the inner peripheral side of the heat-resistant buffer seal member 6 is fixed, but the portion extended to the outer peripheral side is fixed. Also good.
[0032]
In the embodiment of the invention, the heat-resistant buffer seal member 6 is fixed through the fixing member 7. However, the wire mesh constituting the heat-resistant buffer seal member 6 is fixed by spot welding. You may do it.
[0033]
In the embodiment of the present invention, the stainless steel wire mesh is used as the heat-resistant buffer seal member 6, but the material thereof is arbitrary such as using a brass wire mesh.
[0034]
Also, the heat-resistant buffer seal member 6 can be fixed by any method. In addition to spot welding, a normal welding method, a screwing method such as a screw, bolt or nut, a fitting method, a caulking method, or a heat-resistant adhesive is used. It is possible to use a bonding method using
[Brief description of the drawings]
FIG. 1 is a plan view showing a control muffler valve according to an embodiment of the present invention.
2 is a longitudinal sectional view taken along line II-II in FIG. 1, showing a control muffler valve according to an embodiment of the invention.
3 is a longitudinal end view taken along line III-III in FIG. 1, showing a control muffler valve according to an embodiment of the present invention.
FIG. 4 is a longitudinal sectional view showing a conventional control muffler valve.
FIG. 5 is an enlarged cross-sectional view of a main part showing a conventional control muffler valve.
[Explanation of symbols]
P Exhaust pipe 1 Valve seat 11 Pipe part (exhaust pipe part)
DESCRIPTION OF SYMBOLS 12 Tapered sheet | seat part 13 Substrate part 14 Shaft support part 15 Shaft hole 16 Tapered sheet surface 2 Valve body 21 Main body part 22 Tapered seal part 23 Substrate part 24 Shaft support part 25 Shaft hole 26 Tapered seal surface 3 Support shaft 31 Weld 4 Bush 41 Cylindrical body 42 Outward flange 5 Coil spring (biasing member)
6 heat resistant buffer seal member 61 annular taper portion 62 annular horizontal portion 63 through hole 7 fixing member 71 projecting surface portion 72 outer peripheral edge portion

Claims (4)

A valve body that can be opened and closed via a support shaft with respect to a valve seat provided at an end of an exhaust pipe portion in the muffler body, and the valve body is brought into contact with a seat surface of the valve seat to close the valve. In a control muffler valve provided with a biasing means for biasing in the direction,
A heat-resistant buffer seal member is provided on the seal surface side of the valve body that contacts the seat surface of the valve seat,
The control muffler valve according to claim 1, wherein the heat-resistant buffer seal member is fixed to the valve body at a location outside the seal surface of the valve body that contacts the seat surface of the valve seat. A valve body that can be opened and closed via a support shaft with respect to a valve seat provided at an end of an exhaust pipe portion in the muffler body, and the valve body is brought into contact with a seat surface of the valve seat to close the valve. In a control muffler valve provided with a biasing means for biasing in the direction,
A heat-resistant buffer seal member is provided on the seat surface side of the valve seat,
The control muffler valve according to claim 1, wherein the heat-resistant buffer seal member is fixed to the valve seat at a position off the seat surface of the valve seat where the seal surface of the valve body abuts. The valve for a control muffler according to claim 1 or 2, wherein the heat-resistant buffer seal member is made of a wire mesh and is fixed by spot welding. The control muffler valve according to claim 1 or 2, wherein the heat-resistant buffer seal member is fixed via a fixing member.

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